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		[page:Object3D] &rarr;

		<h1>[name]</h1>

		<p class="desc">这一辅助对象显示[page:PositionalAudio]的方向锥。</p>

		<h2>导入</h2>

		<p>
			[name] 是一个附加组件，必须显式导入。
			See [link:#manual/introduction/Installation Installation / Addons].
		</p>

		<code>
			import { PositionalAudioHelper } from 'three/addons/helpers/PositionalAudioHelper.js';
		</code>

		<h2>代码示例</h2>
		<code>
		const positionalAudio = new THREE.PositionalAudio( listener );
		positionalAudio.setDirectionalCone( 180, 230, 0.1 );

		const helper = new PositionalAudioHelper( positionalAudio );
		positionalAudio.add( helper );
		</code>

		<h2>例子</h2>
		<div>[example:webaudio_orientation webaudio / orientation ]</div>

		<h2>构造函数</h2>

		<h3>[name]( [param:PositionalAudio audio], [param:Number range] )</h3>
		<p>
			[page:PositionalAudio audio] -- 将会被可视化的[page:PositionalAudio]。<br /><br/>

			[page:Number range] -- （可选）方向锥的范围。<br /><br/>

			[page:Number divisionsInnerAngle] -- （可选）方向锥内侧部分的分段数。<br /><br/>

			[page:Number divisionsOuterAngle] -- （可选）方向锥外侧部分的分段数。<br /><br/>
		</p>


		<h2>属性</h2>
		<p>共有属性请参见其基类[page:Object3D]。</p>

		<h3>[property:PositionalAudio audio]</h3>
		<p>将会被可视化的[page:PositionalAudio]。</p>

		<h3>[property:Number range]</h3>
		<p>方向锥的范围。</p>

		<h3>[property:Number divisionsInnerAngle]</h3>
		<p>方向锥内侧部分的分段数。</p>

		<h3>[property:Number divisionsOuterAngle]</h3>
		<p>方向锥外侧部分的分段数。</p>

		<h2>方法</h2>
		<p>共有方法请参见其基类[page:Object3D]。</p>

		<h3>[method:undefined dispose]()</h3>
		<p>废置这一辅助对象。</p>

		<h3>[method:undefined update]()</h3>
		<p>更新这一辅助对象。</p>

		<h2>源代码</h2>

		<p>
			[link:https://github.com/mrdoob/three.js/blob/master/examples/jsm/helpers/PositionalAudioHelper.js examples/jsm/helpers/PositionalAudioHelper.js]
		</p>
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